Finding the Fourth Proportional to 2,638.31, 3,957.98 and 789.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.31 : 3,957.98 = 789.38 : x
2. Step 2: Convert to fraction form
   2,638.31/3,957.98 = 789.38/x
3. Step 3: Cross multiply
   2,638.31x = 3,957.98 × 789.38
4. Step 4: Simplify right side
   2,638.31x = 3,124,350.25
5. Step 5: Solve for x
   x = 3,124,350.25/2,638.31
6. Step 6: Final answer
   x = 1,184.22